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phoinix | Staff 14.2K Views
Aug 1, 2026 9:57 AM

DEWALT 20V MAX 1" Pex Expander (Tool Only)

$299

$399

25% off
+ Free S&Hat Amazon
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Deal Details
Amazon has DEWALT 20V MAX 1-in. Pex Expander (Tool Only, DCE400B) for $299. Shipping is free.

Acme Tools has DEWALT 20V MAX 1-in. Pex Expander (Tool Only, DCE400B) for $299. Shipping is free.

Thanks to Deal Hunter phoinix for posting this deal.

About this item:
  • The pex tool expands 3/8-inch - 1-inch Pex Type-A tubing
  • The pex expander tool has an automatic rotating head action for even expansion
  • The pex expansion tool comes with full trigger actuation for use in tight spaces
  • Bright LED work light to help illuminate dark areas
  • Dual-sided hang and belt hooks for convenient storage
  • Rubber overmold for comfortable, ergonomic grip
  • Uses DEWALT PEX Heads. Compatible with Milwaukee and Uponor Heads. (Milwaukee is a registered trademark of Milwaukee Electric Tool Corp. Uponor is a registered trademark of Uponor Oyj.)
Includes:
  • (1) DCE400 PEX Expander
  • (1) DCE40012 ½" PEX Expander Head
  • (1) DCE40034 ¾" PEX Expander Head
  • (1) DCE4001 1" PEX Expander Head
  • (1) PEX Expander Grease
  • (1) Kit Box
  • 3 Year Limited Warranty

Editor's Notes

Written by SubZero5 | Staff
  • About this deal:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
  • About this store:

Original Post

Written by phoinix | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has DEWALT 20V MAX 1-in. Pex Expander (Tool Only, DCE400B) for $299. Shipping is free.

Acme Tools has DEWALT 20V MAX 1-in. Pex Expander (Tool Only, DCE400B) for $299. Shipping is free.

Thanks to Deal Hunter phoinix for posting this deal.

About this item:
  • The pex tool expands 3/8-inch - 1-inch Pex Type-A tubing
  • The pex expander tool has an automatic rotating head action for even expansion
  • The pex expansion tool comes with full trigger actuation for use in tight spaces
  • Bright LED work light to help illuminate dark areas
  • Dual-sided hang and belt hooks for convenient storage
  • Rubber overmold for comfortable, ergonomic grip
  • Uses DEWALT PEX Heads. Compatible with Milwaukee and Uponor Heads. (Milwaukee is a registered trademark of Milwaukee Electric Tool Corp. Uponor is a registered trademark of Uponor Oyj.)
Includes:
  • (1) DCE400 PEX Expander
  • (1) DCE40012 ½" PEX Expander Head
  • (1) DCE40034 ¾" PEX Expander Head
  • (1) DCE4001 1" PEX Expander Head
  • (1) PEX Expander Grease
  • (1) Kit Box
  • 3 Year Limited Warranty

Editor's Notes

Written by SubZero5 | Staff
  • About this deal:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
  • About this store:

Original Post

Written by phoinix | Staff

Community Voting

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Community Reviews

The DEWALT DCE400B is a PEX A expansion tool that stands out for fast, easy installs and strong performance on 1 inch lines. It is described as a workhorse for repiping and a breeze for novice use, with included expander heads making the kit more complete than the tool only label suggests. The main limitation is that the tool only package does not include a battery or charger, and the extra power matters most on larger fittings. It looks like a solid entry into PEX A expansion if 1 inch work is part of the job.

  • Installers who want a multi-size expansion tool, because it comes with 1/2, 3/4, and 1-inch heads and supports multiple tubing sizes.

    mgilchkekwowse01gadesgPhlont

  • DIYers repiping a house with PEX-A, because the expander makes installation easy and works well on full-house runs.

    PM-Me-Your-CouponsThriftyHome996

  • Plumbers or remodelers running lots of 1-inch lines, because the extra power is noticeable on 1-inch fittings and slower tools struggle there.

    imnomythimnomyth

  • Homeowners replacing valves or other fittings, because the expander worked great on a stripped angle stop and made the repair straightforward.

    BraveMorning116

  • Plumbers who mainly use crimp-ring PEX-B, because this tool is aimed at expansion work rather than the crimp style they already use.

    CrimsonCheetah9927AmusedThread3052

  • Installers who need battery and charger included, because the tool-only package does not include them.

    gadesgPhlont

  • Shoppers expecting a 1-inch-only tool, because it actually expands multiple sizes with separate heads.

    mgilch

Common Questions (4)

AI-generated summary based on comments from the community. Updated ago

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23 Comments

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Aug 1, 2026 2:41 PM
395 Comments
Joined Jan 2011
PM-Me-Your-CouponsAug 1, 2026 2:41 PM
395 Comments
This is an excellent tool. Repiped my house with Uponor PEX, this thing was a workhorse and made the job easy.
1
Pro
Aug 1, 2026 5:34 PM
145 Comments
Joined Jun 2018
ytre443
Pro
Aug 1, 2026 5:34 PM
145 Comments
Any plumbers here what is your opinion disregarding price, this or the m12 fuel?
Aug 1, 2026 7:34 PM
245 Comments
Joined Jul 2014
imnomythAug 1, 2026 7:34 PM
245 Comments
Quote from ytre443 View quoted comment :
Any plumbers here what is your opinion disregarding price, this or the m12 fuel?
Not a plumber, but i don't think you could go wrong either way unless you're doing a lot of 1" lines, then go with the dewalt. I have an m12 that I used to completely plumb my house and a few odd jobs for friends. It works incredibly well but it was noticeably slower with 1" lines.
Aug 1, 2026 9:01 PM
573 Comments
Joined Aug 2019
CrimsonCheetah9927Aug 1, 2026 9:01 PM
573 Comments
Is this worth it over a pex b setup? I'm in construction and it seems all the plumbers use the crimp ring style pex.
Aug 1, 2026 9:34 PM
83 Comments
Joined Apr 2024
AmusedThread3052Aug 1, 2026 9:34 PM
83 Comments
Quote from CrimsonCheetah9927 View quoted comment :
Is this worth it over a pex b setup? I'm in construction and it seems all the plumbers use the crimp ring style pex.
plex a is more expensive but easier to work with - i'm guessing the plumbers are using pex b because that is what the contractors are paying for?
Pro
Aug 1, 2026 11:03 PM
145 Comments
Joined Jun 2018
ytre443
Pro
Aug 1, 2026 11:03 PM
145 Comments
Quote from CrimsonCheetah9927 View quoted comment :
Is this worth it over a pex b setup? I'm in construction and it seems all the plumbers use the crimp ring style pex.
pex A is actually cheaper if you want the same flow rate. with pex B you would need to step up to 3/4" to get similar flow rate as 1/2" pex A since pex B fittings reduce the diameter of the line as they are fitted in the pipe instead of stretching the pipe around the fitting like pex A. also pex A is much more flexible so alot of times you can bend the line instead of having to install fittings to change directions.
Aug 2, 2026 12:06 AM
50 Comments
Joined Dec 2011
ishibooAug 2, 2026 12:06 AM
50 Comments
Some PEX B can be used with expansion tools/fittings, and is the same price as regular PEX A. Nice option to have.

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Aug 2, 2026 12:59 AM
38 Comments
Joined Mar 2011
scuba840Aug 2, 2026 12:59 AM
38 Comments
comment deleted
Last edited by scuba840 August 1, 2026 at 06:23 PM.
1
Aug 2, 2026 1:01 AM
38 Comments
Joined Mar 2011
scuba840Aug 2, 2026 1:01 AM
38 Comments
Vevor dot com has a similar tool for $200 if you find a coupon. The vevor tool is a beast and brushless, but I don't know enough about dewalt expanders. The vevor tool comes with 2 each 20v batteries that are rumored to be compatible with Milwaukee....
1
Aug 2, 2026 1:29 AM
12 Comments
Joined Mar 2018
mgilchAug 2, 2026 1:29 AM
12 Comments
Quote from imnomyth View quoted comment :
Not a plumber, but i don't think you could go wrong either way unless you're doing a lot of 1" lines, then go with the dewalt. I have an m12 that I used to completely plumb my house and a few odd jobs for friends. It works incredibly well but it was noticeably slower with 1" lines.
Hi just to be clear this is tool only it's called 1" expander meaning it can use 3/8, 1/2, 3/4 & 1" expander heads(sold separately). It not a 1" only expander. But like I said it's only the tool I don't see that expander heads are included and battery either Description says "The pex tool expands 3/8-inch - 1-inch Pex Type-A tubing"The picture show two expander heads however what's in the box does not say any heads are included
Aug 2, 2026 1:32 AM
12 Comments
Joined Mar 2018
mgilchAug 2, 2026 1:32 AM
12 Comments
Quote from CrimsonCheetah9927 View quoted comment :
Is this worth it over a pex b setup? I'm in construction and it seems all the plumbers use the crimp ring style pex.
Yes pex b the ID(inner diameter) is smaller then pex a. So most pros uses pex a. Pex b is diyerSo if you are concerned about volume use pex a not pex b
Aug 2, 2026 2:03 AM
50 Comments
Joined Dec 2011
ishibooAug 2, 2026 2:03 AM
50 Comments
Quote from CrimsonCheetah9927 View quoted comment :
Is this worth it over a pex b setup? I'm in construction and it seems all the plumbers use the crimp ring style pex.
PEX A is a better pipe (no memory like PEX B), the connections are more reliable (not that crimp rings/stainless clamps are bad, just not as good as expansion pex), and it's quite easy to use. It's a solid improvement over other methods/pipe, but I wouldn't hesitate to use any.

The better flow is nice as well of course.
Aug 2, 2026 5:59 AM
637 Comments
Joined Feb 2007
kekwowse01Aug 2, 2026 5:59 AM
637 Comments
Quote from mgilch View quoted comment :
Hi just to be clear this is tool only it's called 1" expander meaning it can use 3/8, 1/2, 3/4 & 1" expander heads(sold separately). It not a 1" only expander. But like I said it's only the tool I don't see that expander heads are included and battery either Description says "The pex tool expands 3/8-inch - 1-inch Pex Type-A tubing"The picture show two expander heads however what's in the box does not say any heads are included
According to dewalt's page [dewalt.com], DCE400B should includes the following:
  • PEX Expander (DCE400)
  • 1/2" PEX Expander Head (DCE40012)
  • 3/4" PEX Expander Head (DCE40034)
  • 1" PEX Expander Head (DCE4001)
  • PEX Expander Grease
  • Kit Box
Aug 2, 2026 1:25 PM
29 Comments
Joined Dec 2012
gadesgAug 2, 2026 1:25 PM
29 Comments
Quote from mgilch View quoted comment :
Hi just to be clear this is tool only it's called 1" expander meaning it can use 3/8, 1/2, 3/4 & 1" expander heads(sold separately). It not a 1" only expander. But like I said it's only the tool I don't see that expander heads are included and battery either Description says "The pex tool expands 3/8-inch - 1-inch Pex Type-A tubing"The picture show two expander heads however what's in the box does not say any heads are included
It includes the heads. I bought the same kit two months ago. "Tool Only" means it doesn't come with the batteries and charger.

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Aug 2, 2026 5:21 PM
245 Comments
Joined Jul 2014
imnomythAug 2, 2026 5:21 PM
245 Comments
Quote from mgilch View quoted comment :
Hi just to be clear this is tool only it's called 1" expander meaning it can use 3/8, 1/2, 3/4 & 1" expander heads(sold separately). It not a 1" only expander. But like I said it's only the tool I don't see that expander heads are included and battery either Description says "The pex tool expands 3/8-inch - 1-inch Pex Type-A tubing"The picture show two expander heads however what's in the box does not say any heads are included
I know. My point is that the m12 is a bit weak for 1". The dewalt has more power, which is only noticeable with 1" fittings.

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